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Anytime a cat suddenly changes their behavior is is time for concern. It seem unlikely that his meow box ran out. Most vocal cats will continue talking until their last breath.

It may only be something minor, however, he may also have ingested something (such as a turkey splinter) and it is stuck in his throat. He could have been stressed by something you brought home, or the trip itself.

I would suggest an immediate exam of his throat to rule out something that might turn into a bigger problem. Taking the time to rule out a potential problem now, may save you a lot of stress and worry in days to come.